Hi Crasher thanks as always for your reply, Injectors in the original engine were 03L130277s but when they failed we replaced with 03L130277B refurbs with new calibration codes and coded these with VCD's to the ecu. We replaced the engine (engine came without injectors) and put the refurb injectors back in in the same order 1- 4. The HPFP came with the replaced engine so we left it on to see if that was the issue. along with the Crank sensor cam sensor. then we changed the solenoid valves one at a time from the replaced engine as the fault still exists after testing. EGR was also replaced with a new one.